Question about 2000 Saturn Ls 4dr Sedan

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A/c and heater mix not working on 2000 4dr satun

Is it vacuum controled or cable? and what could it be?

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What I would recommend on this would be to find out if the problem is the A/C dash unit itself or something else. Most of these cars the dash is not all that difficult to take out in order to access the A/C dash unit (where all the A/C-heat knobs are). You might need an hour or so and a little determination. Once you have the dash pieces off where you can access the radio and the A/C-heater units you will need to pull the A/C unit out-it is usually held in place by screws or bolts. Once you have it out-disconnect each electrical connector but only one at a time and using a test light commonly found at most parts places test to see whether the light comes on. You will need to familiarize yourself with the test light ahead of time, so test it elsewhere to make sure it works and you know how to operate it. For each connector that has a positive test this means that power is coming through to the unit. If you get a failed test then the problem is elsewhere. If all the tests are positive then the A/C-heater has power coming to it but the unit itself is bad. You can get another one at a parts place or junkyard and once you have everything out the new one is a snap to put in. If you have to get a new one you might be looking at $100 (not 100% certain on the price). But this is something you can do yourself. You can do searches using terms like A/C dash unit replacement and there should be sites with pictures . Hope this helps

Posted on Feb 12, 2009

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REPLACING ac heater programmer in my 1999 cadillac deville


Why ?
Programmer Description
The heater and A/C programmer is attached to a bracket. The bracket is located next to the right end of the heating, ventilation, and air conditioning (HVAC) module assembly, behind the glove box. The heater and A/C programmer provides the controls for temperature regulation.
The heater and A/C programmer controls an electric actuator. The electric actuator adjusts the air mix valve position in order to blend cold and warm air. Vehicles with dual zone (CJ2) have 2 electric actuators that mix the air independently of each other. The motor is reversible and moves a rotary shaft which drives the air mix valve link. The motor also provides a position sensor signal in order to monitor the actual valve position.
The heater and A/C programmer operates the 4 vacuum solenoids. The solenoids control vacuum to the various vacuum actuators. The vacuum actuators control the following components:
• The air inlet valve
• The A/C DEFROST valve
• The UP/DOWN valve
The heater and A/C programmer also controls the park brake release actuator. The powertrain control module (PCM) sends a Class 2 serial data message to the heater and A/C programmer whenever the transmission is shifted out of PARK or NEUTRAL. The heater and A/C programmer will then supply vacuum to the park brake release solenoid, which releases the park brake.
The heater and A/C programmer sometimes is referred to as the air control module (ACM). This reference is commonly used by a scan tool and by the diagnostic trouble codes (DTCs).
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How to access/replace the vent selector(defroster) ?


buy one
and install it.
it has clamps remove them or unsnap them and .....
access? its in the dash.
the FSM covers all HVAC work , you can get that and read it
or hope that ALLDATA.com covers R&R for the cables.
but will cover access. (huge job on some cars)
working on the dash with out and FSM invites more broken parts.
plastics.
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here is the control panel, pasted


Removal & Installation
  1. Remove the upper console panel.
  2. Remove the instrument cluster finish panel
  3. Release the 2 fitting claws and pull out the heater control assembly.
  4. Using a screwdriver, open the claw of the cable clamp and disconnect the defroster damper control cable. NOTE Be careful not to bend the cable wire. If the cable wire bends, the heater control assembly operationally becomes worse.
  5. Using a screwdriver, open the claw of the cable clamp and disconnect the air mix damper control cable.
  6. Disconnect the connector, remove the heater control assembly. 42050_coro_g0008.gif Removal and installation of the control panel
To install:
  1. Install the inner cable end of the air mix damper control cable to the heater control lever.
  2. Install the outer cable of the air mix damper control cable to the cable clamp. NOTE Be careful not to bend the cable wire. If the cable wire bends, the heater control assembly operationally becomes worse.
  3. Operating the heater control knob and check that it properly stops at both ends of MAX. COOL and MAX. HOT and no recoil is identified.
  4. Check that the outer cable should not be disengaged (moved) from the heater control assembly when the cable is pulled.
  5. Install the inner cable end of the defroster damper control cable to the heater control lever.
  6. Install the outer cable of the defroster damper control cable to the cable clamp.
  7. Operating the heater control knob and check that it properly stops at both ends of FACE and DEF and no recoil is identified.
  8. Check that the outer cable should not be disengaged (moved) from the heater control assembly when the cable is pulled.
  9. Connect the connector, install the heater control assembly.
  10. Install the instrument cluster finish panel
  11. Install the upper console panel.

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Hi There I have1994 jeep Grand Cher. cold air on heater, but hot cooland going thro core.The vacum sounds ok switching all directions : windchil , flor, mix up and down. but maybe the vacum is a bit to...


Hi, the blend door is not vacuum operated; however the veater water control valve is. Check to make sure the heater control valve (see pic below) is opening (vacuum motor should turn valve lever). If that's good, check the adjustment of the blend door cable. Make sure the door opens fully when the temp is set to hot. Please let me know if you have questions, and thanks for using FixYa.

jturcotte_167.jpg


jturcotte_871.gif

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1 Answer

I am helping change a thermostat - (we have no manual) where exactly is the thermostat located. This is a 4 cyl, standard trans, 2WD, speedo stopped working at 225K. Heater went out about 6 months ago, AC...


The thermostat cannot cause your heater to go out, though the heater will run a little cooler if the thermostat is stuck open. Please see my tip at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air to troubleshoot the heater. In particular, I would start by checking the temperature control cable adjustments. I have pasted instructions from autozone.com below.

If you really want to change the thermostat, please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . The thermostat is in the housing at the end of the upper radiator hose.

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Heater temperature control cables to blend door and heater water valve--adjustment:
WATER VALVE CONTROL ROD

See Figure 8
When adjusting the water valve control rod, disconnect the temperature control cable at the air mix door lever and then adjust air mix door control cable. Next, adjust the control rod. Reconnect the temperature control cable and then readjust it.
  1. Push the air mix door lever in the correct direction.
  2. Pull the control rod in the direction shown (in the accompanying illustration) until there is an 0.08 in. (2mm) clearance between the ends of the rod and link lever. Connect the rod to the door lever.
jturcotte_114.gif

TEMPERATURE CONTROL CABLE
See Figure 9
Move the temperature control lever to the cold position. Push the cable sheathing and the air mix door lever in the correct and then tighten the clamp. Verify proper operation.

jturcotte_115.gif

Nov 08, 2010 | 1992 Nissan Pickup

1 Answer

The heater control knob will not turn all the way to either hot (right) or cold (left) so therefore I only get medium warm or medium cold. I assume the knob moves a cable but I cannot see it or remove the...


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